package com.yl.demo.utils;

import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by YL on 2019/10/21.
 */
public class CookiesUtil implements Serializable {

    /**
     * 根据名字获取cookie
     *
     * @param request
     * @param name
     *            cookie名字
     * @return
     */
    public static Cookie getCookieByName(HttpServletRequest request, String name) {
        Map<String, Cookie> cookieMap = ReadCookieMap(request);
        if (cookieMap.size() > 0){
            if (cookieMap.containsKey(name)) {
                Cookie cookie = (Cookie) cookieMap.get(name);
                return cookie;
            } else {
                return null;
            }
        }else{
            return null;
        }

    }

    /**
     * 将cookie封装到Map里面
     *
     * @param request
     * @return
     */
    private static Map<String, Cookie> ReadCookieMap(HttpServletRequest request) {
        Map<String, Cookie> cookieMap = new HashMap<String, Cookie>();
        Cookie[] cookies = request.getCookies();
        if (null != cookies) {
            for (Cookie cookie : cookies) {
                cookieMap.put(cookie.getName(), cookie);
            }
        }
        return cookieMap;
    }

    /**
     * 保存Cookies
     *
     * @param response
     *            servlet请求
     * @param value
     *            保存值
     * @author yl
     */
    public static HttpServletResponse setCookie(HttpServletResponse response, String name, String value, int time) {
        if (StringUtils.isNotBlank(name) && StringUtils.isNotBlank(value) && "undefined".equals(name) && "undefined".equals(value)) {
            // new一个Cookie对象,键值对为参数
            Cookie cookie = new Cookie(name, value);
            // tomcat下多应用共享
            cookie.setPath("/");
            // 如果cookie的值中含有中文时，需要对cookie进行编码，不然会产生乱码
            try {
                URLEncoder.encode(value, "utf-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            cookie.setMaxAge(time);
            // 将Cookie添加到Response中,使之生效
            response.addCookie(cookie); // addCookie后，如果已经存在相同名字的cookie，则最新的覆盖旧的cookie
        }
        return response;
    }
}
